I was on the highway when this car went past followed by a police car. They ______ at least 150

km an hour. [ ]

A. should have been doing

B. must have been doing

C. could have done

D. would have done

(91～93题共用题干)男性，60岁，肺气肿史，发热咳嗽一周，痰量多而黏稠，胸片右上肺大片状阴影内有多个空腔，水平裂呈向下弧形

治疗上选择

A．苯唑西林

B．万古霉素

C．庆大霉素+利福平

D．阿米卡旱+头孢西丁